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local-zfs: rephrase ZFS RAID description

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I tried to make the performance impact clearer, as what "behave like a number of disks"
actually means wasn't quite clear to me.

Use "in regard to" rather than "in regard of", as I couldn't find
any source that this phrase is (commonly) used in modern english.

Signed-off-by: Matthias Heiserer <m.heiserer@proxmox.com>
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Matthias Heiserer 2022-11-18 12:09:47 +01:00 committed by Thomas Lamprecht
parent 0d4a93dc78
commit f1b7d1a307
1 changed files with 5 additions and 5 deletions
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@ -167,17 +167,17 @@ Each `vdev` type has different performance behaviors. The two
parameters of interest are the IOPS (Input/Output Operations per Second) and
the bandwidth with which data can be written or read.
A 'mirror' vdev (RAID1) will approximately behave like a single disk in regards
to both parameters when writing data. When reading data if will behave like the
number of disks in the mirror.
A 'mirror' vdev (RAID1) will approximately behave like a single disk in regard
to both parameters when writing data. When reading data the performance will
scale linearly with the number of disks in the mirror.
A common situation is to have 4 disks. When setting it up as 2 mirror vdevs
(RAID10) the pool will have the write characteristics as two single disks in
regard of IOPS and bandwidth. For read operations it will resemble 4 single
regard to IOPS and bandwidth. For read operations it will resemble 4 single
disks.
A 'RAIDZ' of any redundancy level will approximately behave like a single disk
in regard of IOPS with a lot of bandwidth. How much bandwidth depends on the
in regard to IOPS with a lot of bandwidth. How much bandwidth depends on the
size of the RAIDZ vdev and the redundancy level.
For running VMs, IOPS is the more important metric in most situations.